PLATE 43. 



Alveolites constans, Nov. Spec. Devonian. 



1. Lateral view of a corallum from the red clay of the Lower Devonian, 



near Louisville. Collection of the author. 



Alveolites squamosus. Devonian. 



2. 3. Upper surfaces of coralla from the horizon of the preceding species, 



near Louisville. Collection of the author. 



Alveolites minimus, Nov. Spec. Devonian. 



4. Lateral view of a corallum from the Lower Devonian strata, Falls 

 of the Ohio. Collection of the author. 



